Method for controlling axial flow machine e.g. three-phase synchronous permanent magnet machine, involves estimating temperature of rotor according to ambient air temperature and model, and limiting performance of electric machine

摘要

The method involves estimating temperature of a rotor (3) according to ambient air temperature and a model, where the model combines a thermal model representative of the behavior of heat exchange in an electric machine (1) with a correlation between room temperature and temperature of air-gap. Performance of the electric machine is limited to ensure cooling of magnets and integrity of components of the electric machine when the estimated temperature of the rotor is higher than threshold temperature.